Fitment

GM diesel vehicles with SCR AdBlue emission system including

• Chevrolet Silverado 2500HD 6.6L Duramax diesel (2011–2016 selected applications)
• Chevrolet Silverado 3500HD 6.6L Duramax diesel
• GMC Sierra 2500HD 6.6L Duramax diesel
• GMC Sierra 3500HD 6.6L Duramax diesel
• Chevrolet Express 2500 / 3500 diesel
• GMC Savana 2500 / 3500 diesel
• Selected GM heavy-duty diesel SCR systems

OE reference
55497831
24001919 (updated replacement number)

FAQ

What is this NOx sensor used for

It measures nitrogen oxide levels in diesel exhaust gas and sends data to ECU for SCR AdBlue emission control system

Is this inlet or outlet sensor

It is commonly used as NOx Position 1 sensor in SCR system (upstream monitoring before SCR catalyst)

Are 55497831 and 24001919 interchangeable

Yes, 24001919 is listed as the replacement part number for 55497831

What system does it work with

SCR Selective Catalytic Reduction system using AdBlue injection for diesel emission compliance

What are common failure symptoms

Engine warning light SCR AdBlue fault reduced power limp mode NOx sensor communication error emission efficiency faults